Final Jeopardy Freezing Point Depression
Final Jeopardy 25g/58.5g/mol = .43 mol .43 mol/.250Kg = 1.7 m ∆T = 1.86oC/m x 1.7m x (2) = -6.3oC What is the freezing point of a solution made by dissolving 25 grams of NaCl in 250 mL of water?
$200 Kinetic Molecular Theory This theory discusses the movement of molecules in their various states
$400 Boyles Law The pressure and volume of a gas are inversely related
$600 The atmosphere What is the SI unit for pressure?
$800 The pressure will also increase Gay-Lussac would say as the temperature of a gas increases at constant volume
$1000 Combined Gas Law PV = PV T T
$200 Evaporation Process by which liquids change into a gas
$400 Sublimation Phase change from a solid directly to a liquid
$600 Gas In which state do the molecules have the greatest kinetic energy?
$800 Temperature remains constant What happens to temperature during a phase change
$1000 Triple Point Point at which all three states of matter can co-exist
$200 Sand Sand, alloys, soda, which is not homogeneous?
$400 Electrolyte A solution capable of conducting electricity
$600 Compounds that are similar chemically dissolve other compounds that are alike What does “likes dissolve likes” refer to?
$800 2 Molar 4 moles of a solute is dissolved in 2 Liters of solution, what is the Molarity
$1000 PbCl2 Pb2+(aq) + 2 Cl-(aq) Write the equation for the dissolution of PbCl2(s) in water
$200 supersaturated A solution in which no more solute can be dissolved
$400 FP depression and BP elevation Name two colligative properties
$600 Change in temp., molal constant, molality Using the equation ΔT = kf x m Explain the symbols
$800 1 molal NaCl b/c it is an electrolyte and gives you two particles per mole Which would boil at a higher temperature and why? 1 molal glucose or 1 molal NaCl
$1000 5 M, (.5 moles/.100L) Math Question: What is the molarity of 20 grams of NaOH dissolved in 100 mL of water
$200 Base pH greater than 7
$400 Acid [H+ ] > [OH-]
$600 pH = - log [H+] What does pH equal
$800 Sulfuric Acid What is the name of H2SO4
$1000 1 x 10-7 Math Question: If pH = 7, then what is the [OH-]
$200 Arrhenius Definition Bases produce OH- in water solutions
$400 Whose definiton states that Acids are proton donors
$600 8.7 What is pOH if pH = 5.3
$800 pH = 10 [H+] = 1 x 10-10 What is the pH?
$1000 pH = 9 [H+] = 1 x 10-9 so pH = 9 If [OH-] = 1 x 10-5 What is the pH?
$400 Temperature Average kinetic energy of the molecules =
$800 Specific Heat Amount of heat required to raise 1 gram of a substance 1oC
$1200 Is equal to heat lost by the material In calorimetry experiments the heat gained by water
$1600 J = 25g x 8 oC x 4.18 J/goC How much heat is required to raise 25 grams of water from 22oC to 30oC? Specific Heat of water = 4.18 J/goC
$2000 Products should be higher than reactants Come to the board and draw a reaction that is endothermic
$400 Low energy and high entropy In nature reactions tend to go towards what 2 directions?
$800 Randomness or disorder What does entropy mean?
$1200 Reaction mechanism A multistep process for a chemical reaction is called
$1600 Activation energy The energy hump a reaction needs to overcome is called
$2000 Temperature, surface area, catalyst, nature of reactants Name three (3) factors that affect reaction rate.
$400 Rate of the Forward reaction equals the rate of the reverse reaction Define chemical equilibrium
$800 Ka = [CH3COO-] [H3O+] [CH3COOH] Write the equilibrium expression for the following; CH3COOH(aq) + H2O(l) CH3COO-(aq) + H3O(aq)
$1200 A large Ka value A strong acid will have what kind of value for it’s Ka ?
$1600 Left N2(g) + 3 H2(g) 2 NH3(g) + 92 kJ If heat is added the reaction will shift?